On average, the Northern states developed more rapidly than the Southern states. It is tempting to ascribe this to the traditional historical narratives and attribute the general difference to climate or slavery. However, a careful examination of the subtle differences between the states suggests that variations in their political institutions were the main culprit behind how differently they developed. Jeffrey Jensen, a former student of ours and now a faculty member at NYU, Abu Dhabi, did a very careful study of the differences in the size of the interchangeables, influentials, and essential
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